BIOL 1050 Lecture 3Outline of Last LectureI. Process of Sciencea. What is science?b. Hypothesisc. Ways science is conductedd. Scientific TheoryII. VariablesOutline of Current LectureI. ControlsII. Statistics Current LectureI. Controlsa. Individuals in control groups and experimental groups must be treated identically, with the exception of their exposure to the predictor variableb. Background differences can be eliminated between control and experimental groups by randomly assigning individuals to groupsi. Desirable to have each group be a cross-section of the population in the studyc. The control group would receive the placebo treatmentd. The more replicates of an experiment, the more reliable the experimente. Watch out for ambiguous words in an experiment i. Such as “effective” what is determined as effective?f. Sample sizei. Number of subjects in experimental and control group1. Describes the amount of replication2. Larger sample means more reliable resultsg. Single blind studyi. The study group does not know whether they have received the actual test or the placeboh. Double blind studyi. The study group and the experimenters do not know who has and has notreceived the placeboii. Ideal experimentThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.II. Statisticsa. Statistics describe datai. Tells us the probability that our experimental and control group differ by chance aloneii. Statistics cannot correct poor experimentsb. The independents variable will always be on the x axis of a graphc. The dependent variable will always be on the y axis of a graph d. Correlation: a relationship between 2 variablesi. Correlation DOES NOT prove cause and
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